National Highways’ £10m A38 Devon works: asset resilience notes for engineers
Reviewed by Joe Ashwell
First reported on The Construction Index
30 Second Briefing
National Highways is investing over £10m in the A38 through Devon to refurbish two ageing viaducts, upgrade pavement layers and improve surface course performance on key dual carriageway sections. Works include new and reprofiled drainage to manage higher-intensity rainfall, plus targeted removal of ash trees affected by dieback to reduce windthrow and root-plate failure risks adjacent to the carriageway. The programme signals sustained structural maintenance on a major south‑west strategic route, with likely phased traffic management and temporary capacity constraints during construction.
Technical Brief
- Two existing viaducts are being structurally refurbished rather than replaced, indicating residual capacity and life extension.
- Drainage upgrades are being designed around more intense storm events, reducing hydroplaning and subgrade softening risks.
- Ash dieback tree management targets specimens within strike distance of live traffic lanes and structures.
- Surfacing enhancements aim to improve skid resistance and texture depth, supporting wet‑weather braking performance.
- Construction phasing will require temporary traffic management, with associated worker‑interface and live‑traffic safety controls.
Our Take
National Highways’ more than £10m programme on the A38 in Devon sits at the smaller end of its current project slate, compared with recent major junction schemes like the £317M M25 J10 upgrade, suggesting this is targeted renewal rather than capacity-led expansion.
Recent coverage of National Highways in our database includes urgent structural interventions, such as the rapid demolition of a corroded M42 bridge, indicating that asset condition and life-extension are increasingly driving investment decisions on corridors like the A38.
With 907 Infrastructure stories and 2,486 tag-matched pieces on projects, safety and sustainability, the A38 works in Devon align with a pattern in our coverage where National Highways is using mid-scale renewals to bundle safety upgrades and resilience measures into existing routes.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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